# Relationship history for MSHA mine 4202319

Current hierarchy: **Piute County-UT → PIUTE COUNTY ROAD DEPARTMENT → PORTABLE SCREENING PLANT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Piute County Road Department → PORTABLE SCREENING PLANT; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Piute County-UT → PORTABLE SCREENING PLANT; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Piute County-UT → Piute County Road Department; 2001-06-01 to current/open; source msha-controller-operator-history